Gypsum 4 2 CaSO .2H O → Talc 2 2 3MgO.4SiO .H O → Fluorapatite 5 4 3 Ca PO F → Asbestos 2 5 4 11 2 2 Ca Mg Si O OH → 7. Rocky impurities present in a mineral are known as: (a) flux (b) gangue (c) matte (d) slag The valueless materials found in an ore around or mixed with the wanted mineral are known as gangue particles. There are several methods to remove gangue from the main metal ore. Therefore, the correct answer is option (b) gangue.
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